138506927 has 4 divisors (see below), whose sum is σ = 149161320. Its totient is φ = 127852536.

The previous prime is 138506909. The next prime is 138506959. The reversal of 138506927 is 729605831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138506927 - 2¹⁸ = 138244783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138506527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5327177 + ... + 5327202.

It is an arithmetic number, because the mean of its divisors is an integer number (37290330).

Almost surely, 2^138506927 is an apocalyptic number.

138506927 is a deficient number, since it is larger than the sum of its proper divisors (10654393).

138506927 is a wasteful number, since it uses less digits than its factorization.

138506927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10654392.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 138506927 is about 11768.8965922894. The cubic root of 138506927 is about 517.3969107045.

The spelling of 138506927 in words is "one hundred thirty-eight million, five hundred six thousand, nine hundred twenty-seven".